chore: Update BE http errors to be ui friendly (#1994)

* chore: More UI friendly errors

Mainly capitlization + messages prefix error

coderd/csp.go

@@ -23,7 +23,8 @@ func (api *API) logReportCSPViolations(rw http.ResponseWriter, r *http.Request)
 	if err != nil {
 		api.Logger.Warn(ctx, "csp violation", slog.Error(err))
 		httpapi.Write(rw, http.StatusBadRequest, httpapi.Response{
-			Message: "failed to read body",
+			Message: "Failed to read body, invalid json",
+			Detail:  err.Error(),
 		})
 		return
 	}